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Phones can only work when they know where they are and are telling the phone company that. It’s not surveillance, it’s how radio waves work. This is the first reason for the network to work the way it does. The second? Billing. In fact, most of the surveillance networks in the world weren’t built to surveil at all, but to make things work at a fundamental level, and to bill people. Surveillance and intrusion are opportunistically inserted into good infrastructure.